基于性能的大跨径斜拉桥主塔概率地震风险分析  

Performance-based seismic risk analysis of long-span cable-stayed bridge tower

作　　者：武芳文[1] 孟园英 薛成凤[1] 杨源源 纪全有 WU Fangwen;MENG Yuanying;XUE Chengfeng;YANG Yuanyuan;JI Quanyou(School of Highway,Chang＇an University,Xi＇an 710064,Shanxi,China)

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《世界地震工程》2018年第3期23-31,共9页World Earthquake Engineering

基　　金：国家自然科学基金(51408040);陕西省自然科学基金项目(2017JM5110)

摘　　要：地震作用下,若斜拉桥主塔发生损伤,将使整体损伤风险明显提高。因此对斜拉桥主塔进行地震易损性分析来评定主塔的抗震能力,进而评估斜拉桥主塔在设计基准期内的地震损伤风险,具有重要的工程和经济意义。本文通过SAP2000有限元分析软件对某斜拉桥主塔进行了纵横向的地震易损性及危险性分析,结合地震易损性和危险性分析推导出概率地震风险函数,进而开展了斜拉桥的概率地震风险分析。分析结果证明,在100年设计基准期内,纵桥向或横桥向地震作用下,本文斜拉桥"H"型主塔均满足E3水准抗震设防要求。If the main tower that mainly bear load is damaged under the action of earthquake, the overall damage risk of cable - stayed bridge will be significantly increased. Therefore, we needed to assess the seismic resistance of the main tower through the seismic vulnerability analysis, and then assess the seismic risk of the main tower in the design reference period, which had important engineering and economic significance This paper analyzed the seismic vulnerability analysis and seismic hazard analysis of the main tower through SAP2000 finite element analysis software. Based on the analysis of seismic vulnerability analysis and seismic hazard analysis, the probability seismic risk function was deduced, and the probability seismic risk analysis of the main tower was carried out. It showed that during the 100-year design base period, the ＂ H＂ type main pylon of the cable-stayed bridge meets the requirements of E3 standard seismic fortification under the effect of longitudinal or transverse earthquake.

关 键 词：斜拉桥 地震易损性分析 地震危险性分析 概率地震风险分析 基于性能的抗震设计 

分 类 号：U447[建筑科学—桥梁与隧道工程]